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Preparation method and application of heat-resistant titanium alloy bolt for aerospace

An aerospace and titanium alloy technology, applied in the direction of screws, mechanical equipment, threaded fasteners, etc., can solve problems such as complex processes and affecting the heat resistance of titanium alloys

Pending Publication Date: 2022-05-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above process improves the possibility of stagnation when the thread pair is screwed together, the process is complicated, especially the nickel plating will cause the nickel element to diffuse into the titanium matrix at a temperature range of 600°C to 650°C to form a titanium-nickel phase, which will significantly affect the titanium alloy. Heat resistance

Method used

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  • Preparation method and application of heat-resistant titanium alloy bolt for aerospace
  • Preparation method and application of heat-resistant titanium alloy bolt for aerospace
  • Preparation method and application of heat-resistant titanium alloy bolt for aerospace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing a heat-resistant titanium alloy bolt for aerospace, comprising the following steps:

[0034] 1), choose Ti60 alloy Φ6.1mm straight wire;

[0035] 2) According to the length of the polished rod tolerance zone f9 cross recessed 100° countersunk head bolt to be prepared, cut 45mm of Φ6.1mm annealed wire as the bolt blank and send it to the multi-station hot heading machine, and make one end of the bolt blank by induction heating For a bolt head with a diameter of 12mm, the parameters of the primary induction heating process are current 1175A, the holding time is 16s, and the deformation is 50% of the total deformation; the secondary heating induction heating parameters are current 1125A, the holding time is 16s, and the deformation The deformation amount is 30% of the total deformation amount; the three-time hot heading induction heating process parameters are current 1125A, holding time 8s, and the deformation amount is 20% of the total deformation ...

Embodiment 2

[0043] A method for preparing a heat-resistant titanium alloy bolt for aerospace, comprising the following steps:

[0044] 1), choose Ti60 alloy Φ6.1mm straight wire;

[0045] 2) According to the length of the f9 hexagonal head bolts in the polished rod tolerance zone to be prepared, cut 40mm of Φ6.1mm annealed wire as the bolt blank and send it to the multi-station hot heading machine, and make one end of the bolt blank into a 12mm diameter by induction heating For the bolt head, the parameters of the induction heating process for the primary heat upsetting are current 1225A, the holding time is 8s, and the deformation is 55% of the total deformation; 25% of the amount; the process parameters of the three-time hot heading induction heating are current 1075A, holding time 16s, and the deformation amount is 20% of the total deformation amount, and the first-grade semi-finished product of Ti60 titanium alloy bolts is obtained;

[0046] 3) The first-class semi-finished product o...

Embodiment 3

[0054] A method for preparing a heat-resistant titanium alloy bolt for aerospace, comprising the following steps:

[0055] 1), choose Ti60 alloy Φ6.1mm straight wire;

[0056] 2) According to the length of the f9 hexagon head bolts in the polished rod tolerance zone to be prepared, 45mm of Φ6.1mm annealed wire is cut off as the bolt blank and sent to the multi-station hot heading machine, and one end of the bolt blank is made into a 12mm diameter by induction heating. For the bolt head, the parameters of the induction heating process for the primary heat upsetting are current 1225A, the holding time is 8s, and the deformation is 45% of the total deformation; 30% of the total amount; the process parameters of the three-time hot heading induction heating are current 1075A, holding time 16s, and the deformation amount is 25% of the total deformation amount, and the first-class semi-finished product of Ti60 titanium alloy bolts is obtained;

[0057] 3) The first-class semi-finish...

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Abstract

The invention provides a machining and manufacturing method and application of a heat-resistant titanium alloy Ti60 bolt for aerospace. The heat-resistant titanium alloy Ti60 bolt is prepared from Ti60 titanium alloy bars and wires. Firstly, one end of a bolt blank is made into a bolt head with the diameter being 8-16 mm through a three-time hot upsetting technology, and a first-stage semi-finished product of the Ti60 titanium alloy bolt is obtained; the Ti60 titanium alloy bolt is subjected to solution treatment at the temperature of 1000-1040 DEG C, and a second-stage semi-finished product of the Ti60 titanium alloy bolt is obtained; performing size processing on the Ti60 titanium alloy bolt secondary semi-finished product, performing warm rolling on the rod part of the Ti60 titanium alloy bolt secondary semi-finished product subjected to size processing to form a threaded section, and obtaining a Ti60 titanium alloy bolt tertiary semi-finished product; and the third-stage semi-finished product of the Ti60 titanium alloy bolt is subjected to aging treatment at the temperature of 680-720 DEG C in a vacuum heat treatment furnace, and a finished product of the Ti60 titanium alloy bolt is obtained. Through combination of different processing and heat treatment processes, the titanium alloy bolt with excellent tensile strength, shear strength, high-temperature durability and room-temperature and high-temperature fatigue performance can be obtained, and the titanium alloy bolt is suitable for being used within the range of 600-650 DEG C.

Description

technical field [0001] The invention relates to the field of titanium-based alloys, in particular to a manufacturing method and application of titanium alloy bolts used at 600°C to 650°C. Background technique [0002] Due to its high specific strength, non-magnetic properties, excellent corrosion resistance, wide operating temperature range, and excellent fatigue resistance, titanium alloys are very suitable for aerospace applications, such as aero-engine hot-end parts, aircraft skin fasteners, etc. . Titanium alloy is more corrosion-resistant than alloy steel and does not require protective coating in many environments, so it is also a fastener material used in some harsh environments such as corrosion or high temperature. The weight reduction effect produced by the use of titanium alloy fasteners will have a huge effect on improving the propulsion of the aircraft, increasing the range, and saving fuel. [0003] At present, aerospace titanium alloy bolts are widely used, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00F16B35/00
CPCB23P15/00F16B35/00
Inventor 朱绍祥王清江刘建荣王磊陈志勇李文渊赵子博
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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